The iOS Safari Black Box Bug
Transparent HEVC/MP4 files frequently break on iOS Safari, leaving your beautiful design obscured by an unappealing solid black box or failing to render altogether.
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Web development frameworks give you complete creative freedom, but traditional media formats break the user experience.
Transparent HEVC/MP4 files frequently break on iOS Safari, leaving your beautiful design obscured by an unappealing solid black box or failing to render altogether.
Exporting animations as GIFs forces a 256-color limit, introduces jagged dithered edges, and results in heavy file sizes that hurt your site's PageSpeed metrics.
Complex paths or integrated raster images inside Lottie/Bodymovin JSON files can saturate CPU cycles, causing noticeable lag and stuttering during webpage scrolling.
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Transparent web animations need different strategies depending on your platform and compatibility goals. Pick the workflow that fits your stack:
The safest choice for Webflow HTML Embeds and any custom code block. A single high-fidelity APNG plays with true alpha transparency across all major browsers, fully avoiding animated WebP issues on legacy iOS Safari (14–15).
Serve lightweight WebP to browsers that support it, with APNG as the fallback when WebP is unavailable. Best when your audience is primarily on desktop or Safari 16+. Note: Safari 14–15 may still select WebP and freeze on the first frame — use Method 1 for those users.
Drag the APNG (.png) or WebP exported from TransMov directly onto your Framer canvas — no embed code required. For the most reliable transparent playback on all mobile breakpoints, prefer APNG; WebP works well when your audience is on Safari 16+ and other modern browsers.
TransMov Pro exports both web-optimized APNG and WebP assets locally in one click
Want to go deeper on format choice and workflow? Explore these guides: